Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
dang maut » dang mat, dang vat, dong mau
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, thien van, lieu va
dang mau » dong mau, dang van, dang su
van cam » van nam, van lam, van cau
ca tren » cau tren, cu tren, la tren
luc va » tuc va, loc va
tai ca » tai cac, tai cao, tai cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y ((dang mau) or (dang maut)) hoi. hieu van cam ((luc va) or (duc va)) thanh tai ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y ((dang mau) OR (dang maut)) hoi. hieu van cam ((luc va) OR (duc va)) thanh tai ca tren.
• Adding a wildcard symbol may retrieve word variants: hoc sach y ((dang mau) or (dang maut)) hoi. hieu van cam ((luc va) or (duc va)) thanh tai ca tren*.